<template>
  <el-upload
    class="avatar-uploader" :disabled="disabled"
    :action="uploadURL"
    :show-file-list="false"
    :on-success="handleImageSuccess"
    :before-upload="beforeAvatarUpload">
    <img v-if="value" :src="value" class="avatar">
    <i v-else class="el-icon-plus avatar-uploader-icon"></i>
  </el-upload>
</template>

<script>
import UploadAPI from '@/api/upload';
import { getToken } from '@/utils/auth';

export default {
    props: {
        value: {
            type: String,
            default: ''
        },
        disabled: {
            type: Boolean,
            default: false
        }
    },
    computed: {
        uploadURL() {
            // with login token
            return UploadAPI.uploadURL + '?_t_=' + getToken();
        }
    },
    methods: {
        beforeAvatarUpload(file) {
            const isIMG = file.type.startsWith('image');
            const isLt2M = file.size / 1024 / 1024 < 2;
            if (!isLt2M) {
                this.$message.error('上传头像图片大小不能超过 2MB!');
            }
            return isIMG && isLt2M;
        },
        handleImageSuccess(res, file) {
            this.$emit('update:value', res.obj[0]);
        }
    }
};
</script>

<style lang="scss">
  .avatar-uploader .el-upload {
    border: 1px dashed #d9d9d9;
    border-radius: 6px;
    cursor: pointer;
    position: relative;
    overflow: hidden;
  }

  .avatar-uploader .el-upload:hover {
    border-color: #409EFF;
  }

  .avatar-uploader-icon {
    font-size: 28px;
    color: #8c939d;
    width: 178px;
    height: 178px;
    line-height: 178px;
    text-align: center;
  }

  .avatar {
    width: 178px;
    height: 178px;
    display: block;
  }
</style>
